Exchange 2013 - Calendar problems
We upgraded to Exchange 2013 during the summer as all seemed to be well. However on client computers when accessing Calendars in Outlook 2010 occasionally it will go to not responding for maybe 2-3 mins before opening up Calendars also, when using Shared Calendars, even though a user has Author or even Owner permissons on another Calendar the New Appointment is Greyed out and the User has to submit as request to the Calendar owner. However on other occasions it is absolutley fine.
We also have shared Booking facilities that we use a URL and OWA. However since Exchange 2013 Users now need to enter their Username and Password before they see the shared Calendar, In Exchange 2007 they could get straight into the Calendar.
I have tried removing and re-adding the permissions using Exchange Powershell and this has had no affect.
Any advice welcome